AV9107C-11 Datasheet, PDF (1/1 Pages) Integrated Circuit Systems – Green PC CPU Frequency Generator

Integrated
Circuit
Systems, Inc.
AV9107C-11
Green PC CPU Frequency Generator
General Description
TheAV9107C-11 offers a tiny footprint solution for generating
a fixed system clock and a selectable CPU clock. The 16
selectable CPU frequencies provide all necessary clocks for
386, 486 and Pentium systems.
In addition, the AV9107C-11 has one pin that, when forced
low, will slow the CPU clock to 8 MHz. This feature is
important in systems that have dynamic microprocessors.
Dynamic microprocessors have a minimum operating speed,
typically 8 MHz. In“green” PCs, the designer often wants to
slow the CPU to its minimum operating speed to save power.
The AV9107C-11 will smoothly slow the CPU to 8 MHz when
the SLOWCLK pin goes low.
TheAV9107C-11 is fabricated using 0.8m CMOS technology.
As a result, a 45/55 duty cycle can be achieved on the CPU
clock and ±250ps worst case absolute jitter.
14-Pin SOIC
Features
• One pin slows CPU clock to 8 MHz
• Provides system clock and selectable CPU clock
• On-chip loop filter
• Runs up to 66 MHz at 3.3V
• Worst case cycle-to-cycle variation of 0.1%
• Smooth transition from one CPU frequency to another
or to 8 MHz
• Lowest jitter, ±250ps absolute
• 16 internal frequencies for 386, 486 or Pentium
systems
• Worst case duty cycle of 45/55 on CPU clock
Functionality
FS3
FS2
FS1
0
0
0
0
0
0
0
0
1
0
0
1
0
1
0
0
1
0
0
1
1
0
1
1
1
0
0
1
0
0
1
0
1
1
0
1
1
1
0
1
1
0
1
1
1
1
1
1
FS0
CLK1
0
16.00 MHz
1
39.99 MHz
0
50.11 MHz
1
80.01 MHz
0
66.58 MHz
1 100.23 MHz
0
8.02 MHz
1
4.01 MHz
0
8.02 MHz
1
20.00 MHz
0
25.06 MHz
1
39.99 MHz
0
33.25 MHz
1
50.11 MHz
0
30.00 MHz
1
4.01 MHz
Block Diagram
AV 9107-11 RevA052197
PRODUCT REVIEW documents contain information on products in the formative or design
phase of development. Characteristic data and other specifications are design goals. ICS
reserves the right to change or discontinue these products without notice.